Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 8 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/30/2021   10:58:44   (   0.05,-137.19) (   0.49,-139.27)  236.13                80
 08/31/2021   10:37:05   (   0.05,-137.18) (  -0.51,-134.67)  286.16                80
 09/01/2021   22:58:40   (  -0.04,-137.17) (  -0.64,-139.88)  308.65                80
 09/02/2021   22:42:22   (  -0.04,-137.16) (   0.36,-135.28)  213.23                80
 09/04/2021   11:01:10   (   0.03,-137.13) (   0.76,-140.47)  379.71                80
 09/05/2021   10:44:52   (   0.02,-137.11) (  -0.25,-135.87)  141.71                80
 09/06/2021   23:03:47   (  -0.01,-137.09) (  -0.91,-141.08)  454.32                80
 09/07/2021   22:47:29   (  -0.01,-137.07) (   0.09,-136.48)   67.10                80
 09/10/2021   10:49:58   (   0.01,-137.02) (   0.02,-137.07)    5.63                80
 09/12/2021   22:49:55   (  -0.01,-136.96) (  -0.16,-137.68)   82.52                80